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/*
* Copyright (C) 2012 Christian Halstrick
* and other copyright owners as documented in the project's IP log.
*
* This program and the accompanying materials are made available
* under the terms of the Eclipse Distribution License v1.0 which
* accompanies this distribution, is reproduced below, and is
* available at http://www.eclipse.org/org/documents/edl-v10.php
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* - Neither the name of the Eclipse Foundation, Inc. nor the
* names of its contributors may be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.eclipse.jgit.util;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.HashMap;
import java.util.Map;
/**
* Parses strings with time and date specifications into {@link Date}.
*
* When git needs to parse strings specified by the user this parser can be
* used. One example is the parsing of the config parameter gc.pruneexpire. The
* parser can handle only subset of what native gits approxidate parser
* understands.
*/
public class GitDateParser {
// Since SimpleDateFormat instances are expensive to instantiate they should
// be cached. Since they are also not threadsafe they are cached using
// ThreadLocal.
private static ThreadLocal<Map<ParseableSimpleDateFormat, SimpleDateFormat>> formatCache = new ThreadLocal<Map<ParseableSimpleDateFormat, SimpleDateFormat>>() {
protected Map<ParseableSimpleDateFormat, SimpleDateFormat> initialValue() {
return new HashMap<ParseableSimpleDateFormat, SimpleDateFormat>();
}
};
// Gets an instance of a SimpleDateFormat. If there is not already an
// appropriate instance in the (ThreadLocal) cache the create one and put in
// into the cache
private static SimpleDateFormat getDateFormat(ParseableSimpleDateFormat f) {
Map<ParseableSimpleDateFormat, SimpleDateFormat> map = formatCache
.get();
SimpleDateFormat dateFormat = map.get(f);
if (dateFormat != null)
return dateFormat;
SimpleDateFormat df = SystemReader.getInstance().getSimpleDateFormat(
f.formatStr);
map.put(f, df);
return df;
}
// An enum of all those formats which this parser can parse with the help of
// a SimpleDateFormat. There are other formats (e.g. the relative formats
// like "yesterday" or "1 week ago") which this parser can parse but which
// are not listed here because they are parsed without the help of a
// SimpleDateFormat.
enum ParseableSimpleDateFormat {
ISO("yyyy-MM-dd HH:mm:ss Z"), //
RFC("EEE, dd MMM yyyy HH:mm:ss Z"), //
SHORT("yyyy-MM-dd"), //
SHORT_WITH_DOTS_REVERSE("dd.MM.yyyy"), //
SHORT_WITH_DOTS("yyyy.MM.dd"), //
SHORT_WITH_SLASH("MM/dd/yyyy"), //
DEFAULT("EEE MMM dd HH:mm:ss yyyy Z"), //
LOCAL("EEE MMM dd HH:mm:ss yyyy");
String formatStr;
private ParseableSimpleDateFormat(String formatStr) {
this.formatStr = formatStr;
}
}
/**
* Parses a string into a {@link Date}. Since this parser also supports
* relative formats (e.g. "yesterday") the caller can specify the reference
* date. These types of strings can be parsed:
* <ul>
* <li>"now"</li>
* <li>"yesterday"</li>
* <li>"(x) years|months|weeks|days|hours|minutes|seconds ago"<br>
* Multiple specs can be combined like in "2 weeks 3 days ago". Instead of
* ' ' one can use '.' to seperate the words</li>
* <li>"yyyy-MM-dd HH:mm:ss Z" (ISO)</li>
* <li>"EEE, dd MMM yyyy HH:mm:ss Z" (RFC)</li>
* <li>"yyyy-MM-dd"</li>
* <li>"yyyy.MM.dd"</li>
* <li>"MM/dd/yyyy",</li>
* <li>"dd.MM.yyyy"</li>
* <li>"EEE MMM dd HH:mm:ss yyyy Z" (DEFAULT)</li>
* <li>"EEE MMM dd HH:mm:ss yyyy" (LOCAL)</li>
* </ul>
*
* @param dateStr
* the string to be parsed
* @param now
* the base date which is used for the calculation of relative
* formats. E.g. if baseDate is "25.8.2012" then parsing of the
* string "1 week ago" would result in a date corresponding to
* "18.8.2012". This is used when a JGit command calls this
* parser often but wants a consistent starting point for calls.<br>
* If set to <code>null</code> then the current time will be used
* instead.
* @return the parsed {@link Date} or <code>null</code> if this string was
* not parseable.
*/
public static Date parse(String dateStr, Calendar now) {
dateStr = dateStr.trim();
Date ret;
ret = parse_relative(dateStr, now);
if (ret != null)
return ret;
for (ParseableSimpleDateFormat f : ParseableSimpleDateFormat.values()) {
ret = parse_simple(dateStr, f);
if (ret != null)
return ret;
}
return null;
}
// tries to parse a string with the formats supported by SimpleDateFormat
private static Date parse_simple(String dateStr, ParseableSimpleDateFormat f) {
SimpleDateFormat dateFormat = getDateFormat(f);
try {
dateFormat.setLenient(false);
return dateFormat.parse(dateStr);
} catch (ParseException e) {
return null;
}
}
// tries to parse a string with a relative time specification
private static Date parse_relative(String dateStr, Calendar now) {
Calendar cal;
SystemReader sysRead = SystemReader.getInstance();
// check for the static words "yesterday" or "now"
if ("now".equals(dateStr)) {
return ((now == null) ? new Date(sysRead.getCurrentTime()) : now
.getTime());
}
if (now == null) {
cal = new GregorianCalendar(sysRead.getTimeZone(),
sysRead.getLocale());
cal.setTimeInMillis(sysRead.getCurrentTime());
} else
cal = (Calendar) now.clone();
if ("yesterday".equals(dateStr)) {
cal.add(Calendar.DATE, -1);
cal.set(Calendar.HOUR_OF_DAY, 0);
cal.set(Calendar.MINUTE, 0);
cal.set(Calendar.SECOND, 0);
cal.set(Calendar.MILLISECOND, 0);
cal.set(Calendar.MILLISECOND, 0);
return cal.getTime();
}
// parse constructs like "3 days ago", "5.week.2.day.ago"
String[] parts = dateStr.split("\\.| ");
int partsLength = parts.length;
// check we have an odd number of parts (at least 3) and that the last
// part is "ago"
if (partsLength < 3 || (partsLength & 1) == 0
|| !"ago".equals(parts[parts.length - 1]))
return null;
int number;
for (int i = 0; i < parts.length - 2; i += 2) {
try {
number = Integer.parseInt(parts[i]);
} catch (NumberFormatException e) {
return null;
}
if ("year".equals(parts[i + 1]) || "years".equals(parts[i + 1]))
cal.add(Calendar.YEAR, -number);
else if ("month".equals(parts[i + 1])
|| "months".equals(parts[i + 1]))
cal.add(Calendar.MONTH, -number);
else if ("week".equals(parts[i + 1])
|| "weeks".equals(parts[i + 1]))
cal.add(Calendar.WEEK_OF_YEAR, -number);
else if ("day".equals(parts[i + 1]) || "days".equals(parts[i + 1]))
cal.add(Calendar.DATE, -number);
else if ("hour".equals(parts[i + 1])
|| "hours".equals(parts[i + 1]))
cal.add(Calendar.HOUR_OF_DAY, -number);
else if ("minute".equals(parts[i + 1])
|| "minutes".equals(parts[i + 1]))
cal.add(Calendar.MINUTE, -number);
else if ("second".equals(parts[i + 1])
|| "seconds".equals(parts[i + 1]))
cal.add(Calendar.SECOND, -number);
else
return null;
}
return cal.getTime();
}
}
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